Fireproof construction.



PATBNTED NOV, 3, 1903 H. L. KUBBERNUSS. FIREPROOF GONSTRUGTIONV APPLICATION FILED MAY 27. 1903.

N0 MODEL.

WI T/VE SSE S.

UNITED STATES Patented November 3, 1903.

PATENT OFFICE.

FIREPROOF CONSTRUCTION.

SPECIFICATION forming part of Letters Patent N 0. 743,295, dated November 3, 1903. Application filed May 2'7, 1903. fierial No. 158,979. (No model.)

To aZZ whom it may concern:

Be it known that I, HERMANN L. KUBBER- NUSS, a subject of the Emperor of Germany, residing at the city of St. Louis, State of Missouri, have invented certain new and useful Improvements in Fireproof Constructions, of which the following is a specification.

This invention relates to means for improving fireproof constructions.

In the drawings, Figure 1 is a vertical sectional view through the center of a column formed in the manner hereinafter described. Fig. 2 is a perspective view of a fragment of the same. Fig. 3 is a sectional View on the line 3 3, Fig. l; and Fig. 4 isasectional view of a fragment of this construction of modified form.

In fireproof constructions it is customary to envelop the parts of wooden buildings with an incombustible sheath and also similarly to envelop iron pillars, beams, and the like to prevent their being warped by heat. In such constructions it is preferable that these incombustible envelops should be spaced away from the parts they cover or envelop in order to allow for different ratios of expansion and contraction at the same temperature of an iron pillar-for instance, as compared to the fireproof sheathing-eunder the varying conditions of heat and cold. This pro vides an air-space between the envelop and the part thus enveloped.

While I have illustrated my invention as applied to the fireproofing of a pillar, it is obvious that the idea and means can be readily adapted to any form of fireproof construction.

Referring to the drawings, 1 is the column to be rendered fireproof, and 2 is the fireproof covering, composed of any suitable insulating material. An air-space 3 is located between the column 1 and the fireproof envelop 2 and surrounding the column 1. The

fireproof envelop is composed of whatis sometimes known as wire-plaster, which in this instance is shown as formed by spreading the plaster upon a piece of reticulated material or wire-netting 4, having between it and the main body of the plaster the heavy wires or rods 5, which help to give strength. This netting embedded in the plaster enables the plaster to stand, the netsu'pportingits weight and giving it a measure of strength and rigidity and preventing any tendency easily to collapse.

In my improved construction I locate a spiral wire or similar resilient material in the airspace 3, which surrounds the column 1, and this determines and preserves the fixed size of the air-space 3, except as afiected by the unequal expansion and contraction of the iron and the plaster, as above mentioned, the width of the air-space 3 being the same as the diameter of the winds of the wire 7. The presence of the spiral wire 7 in the air-space 3 intermediately maintains the sheath 2 in connection with the pillar 1. The spring is also useful as a convenient and simple means for exactly determining the size of the air- I-IERMANN L. KUBBERNUSS.

Witnesses:

MAUD E. LETCHER, TERESA MURPHY. 

